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Kernel: Don't flush TLB after creating brand-new mappings

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The CPU will not cache TLB entries for non-present mappings, so we
can simply skip flushing the TLB after creating entirely new mappings.
This commit is contained in:
Andreas Kling 2022-01-12 21:47:23 +01:00
parent 068aea660c
commit de05223122
1 changed files with 2 additions and 2 deletions
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4
Kernel/Memory/AddressSpace.cpp
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@ -165,7 +165,7 @@ ErrorOr<Region*> AddressSpace::allocate_region(VirtualRange const& range, String
region_name = TRY(KString::try_create(name));
auto vmobject = TRY(AnonymousVMObject::try_create_with_size(range.size(), strategy));
auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), 0, move(region_name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, false));
TRY(region->map(page_directory()));
TRY(region->map(page_directory(), ShouldFlushTLB::No));
return add_region(move(region));
}
@ -191,7 +191,7 @@ ErrorOr<Region*> AddressSpace::allocate_region_with_vmobject(VirtualRange const&
region_name = TRY(KString::try_create(name));
auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), offset_in_vmobject, move(region_name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, shared));
auto* added_region = TRY(add_region(move(region)));
TRY(added_region->map(page_directory()));
TRY(added_region->map(page_directory(), ShouldFlushTLB::No));
return added_region;
}